Calcining or analogous furnace



(No Model.) I

Gr. W. GOETZ. GALUINING 0B- ANALOGOU$ FURNACE.

No. 443,438. Patented Dec. 23, 1890.

K P. H" Mm INVENTOR.

WITNESSES.

ATTORNEY.

' UNITED STATES PATE T OFFICE.

GEORGE IV. GOETZ, OF MIIAVAUKEE, \VISCONSIN.

CALCINING OR ANALOGOUS FURNACE.

SPECIFICATION forming part of Letters Patent No. 443,438, dated December 23, 1890.

I Application filed June 4, 1890. Serial No. 354,198. (No model.)

.To all whom, it may cojwcrn:

Be it known that I, GEORGE WV. GOETZ, of

Milwaukee, in the county of Milwaukee, and in the State of Wisconsin, have invented certain new and useful Improvements in Calciuing or Analogous Furnaces; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to calcining and analogous furnaces; and it consists in certain peculiarities of construction, as will befully set forth hereinafter and subsequently claimed.

In the drawings, Figure 1 is a vertical 1011- gitudinal section of one form of my improved device. Figs. 2 and 4 are like views of other forms, and Fig. 3 is a horizontal section on the line 3 3 of Fig. 2.

Heretofore in calcining furnaces a serious objection has often existed from the mixture of the ashes of the fuel employed with the material undergoing calcination. Another objection has been found in the inconvenience of interrupting the process of caloination to remove, for use or storage, portions already calcined, and a third objection has arisen from the necessity of a separate and frequently more or less remote place of storage for the completed product, and to remedy these objections, as well as to improve and simplify the general construction of such furnaces, are the principal objects of my present invention.

A, Fig. 1, represents the calcining-chamber of a furn ace, which in this instance is of the style known as a reouperator, having, however, a storage chamber or magazine 13 beneath the point constituting the hearth of a calcining-furnace of ordinary construction. 0 is the gas or oil pipe, and below this are the air-inlets D into the calcining chamber, and connecting, as shown, by dotted lines, with the air-fines E E E of the recuperator and the outside air-fines F F F. G represents the smoke-outlets from the chamber A, communicating with the smoke-fines H H of the recuperator, and thence with the chimneyfiue I. J J are a series of openings in the wall of the storage-magazine B, extending partly around the same and communicating with a bustle-pipe K, havinga fiue L leading to the chimney-flue I, said flue L havinga conveniently disposed regulating damper M, as shown.

In Figs. 2 and 3 I show my invention applied to a Siemens regenerator furnace, A representing the calcining chamber and B the storage-magazine, as before, C O the gas or oil pipes, and D G the interchangeable or alternating air-inlets and smoke-outlets of the chamber A, as the case may be, E E representing the regenerative-chambers filled with the usual checker-work, and F H the interchangeable or alternating chimney-flue and outside air-flue, the location of the reversing-valve 1 (shown in dotted lines in Fig. 3) determining whether F or H isrthe chimney-fl ue or air-supply flue, and therefore whether D or G are the air-inlets or smokeoutlets of the chamber A at any time. In the arrangement shown in said figures gas or oil from pipe 0 and air from fiues D is fired, and smoke escapes through fines G, and hence F would be the chimney-fine and H the airsupply fine in this instance. ,J J represent openings into the bustle-pipe K, as before, and the flue L from the pipe K must of course lead to a point on the chimney-flue beyond the valve 1, as shown in Fig. 3.

In Fig. 4 I show my invention applied to a coal-fired furnace. A is the calcining-chamber, and B the storage-magazine, as before; having smoke-openings J J leading to a bustle-pipe K, with fine L leading to a chimneyflue. N represents a fire-bed or grating, and O a cupola. P P are doors leading into the calcining-chamber A in all the views, while Q Q, are other doors at the base of the storage-magazine in all the views.

The furnace shown in Fig. 4 is fed with the raw material to be'calcined or treated through the charging-doors R in the cupola 0; but in the other forms illustrated I make use, preferably, of hoppers or chutes S, (having suitable cut-offs 1,) leading to just above openings U in the tops of the chambers A, which openings are closed by suitable doors or slides V.

The operation of my devices will be readily understood from the foregoing description of their construction, taken in connection with the accompanying drawings.

I will first describe the operation of the fur-- nace shown in Fig. 1. lhe raw material (such opening U into the chamber A, filling first the storage-magazine B, and then being spread evenly above the base or hearth proper of the chamberA, access thereto being had by means of the doors P. Gas or oil is then turned on in the pipe 0, and uniting with air from the inlets D is fired and the process of calcination commences, being aided by the suction through the openings J J, which serves to draw down the hot products of combustion 7 tion lies in its adaptability for over-burning limestone, magnesite, cement, or other substances, as this can be admirably done in my from the hearth through the interstices be tween the masses or piecesof the material be.- ing treated, the smoke therefrom passing through the bustle-pipe K and flue L to the chimney-flue I and thence out. The smoke and hot gases that escape through the outlets G pass through the recuperator-fiues-ll in the usual manner, and thereby heat theair in the flu-es E E, asis well understood, The furnace shown in Figs. 2 and 31 is similarly fed and fired, and thepassage of the air and the hot gases and; smoke is that usual to furnaces or this general type.

The furnaceshown in Fig. l is. fed with the raw material through the doorsR of the en pola 0-, as already stated. and? access being had to the interior of theehamberAi through its. doors P. The said material is first raked into the storage-magazine B:unti l1 that is full and then spread overthe'surrfaceofi thehearth proper and the feeding continued until said material has filled; the cupola 0 to nearly the charging point or about on a level= with the charging-floorN insaid Fig. 4. As-the material in the upper part of the magazi neB' and on the=hearth becomes calcined, theraw gradually withdrawn material below is through the doors Q until said magazine B contains only the calcined material, and then this material is withdrawn as needed for shipment or to make room for the fresh material being constantly calcined above it, and hence (after the furnace has been started) the magazine B acts as a storage-chamber (in all the forms shown) and with the material therein contained constitutes always a portion of the hearth of the furnace.

A veryimportant use of my present invenfurnaces without the least mingling of the ashes of the fuel with the material being burned.

Having thus described my invention, what I claim: as new, and desire to secure by Letters llatent, is

In a furnace, thecombination of a calcining-chamber, air and smoke passages, coinmunicating therewith, means forhea-ting said chamber, a storage-magazine located beneath and forming a part of the/hearth ofsaid chamber, and a bustle-pipe having openings into said storage nagazi nc, and a damper-control led flue leading to tlie chimney-flue of the furnace, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee andStateofi Wisconsin, in the presence of'two witnesses.

GEORGE W. GOE'FZ. Witnesses-z G. F. FRICKE, I. C. EI'LLI'BRIDGE. 

